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WASTEWATER COLLECTIONS III EXAM
QUESTIONS AND ANSWERS 2025
First action for a polymer spill - .....ANSWER ...✔✔
Apply an absorbent to the spill such as sand or kitty
litter and then sweep up the materials.
Total discharge head includes - .....ANSWER ...✔✔
Discharge pressure head + static discharge head +
Velocity head (outlet) + Friction Head (discharge line)
Where is the best location to collect a sample? -
.....ANSWER ...✔✔ A location that represents the
entire waste stream or basin.
What are the preservation and hold times for BOD
samples? - .....ANSWER ...✔✔ 48 hours at < or = to
6 degrees C.
Define BOD. - .....ANSWER ...✔✔ The rate at which
organisms use the oxygen in water or waste water while
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stabilizing decomposeable organic matter under
aerobic conditions.
What is the purpose of a dessicator? - .....ANSWER
...✔✔ To allow residual samples to control moisture
prior to weighing.
What will happen if the flow to the grit chamber is too
low? - .....ANSWER ...✔✔ Too much organic material
will be deposited.
How does an operator control the suspended solids in an
activated sludge basin? - .....ANSWER ...✔✔ By
wasting and returning activated sludge.
Chlorine combines with ammonia to form what -
.....ANSWER ...✔✔ Chloramines
What can the operator control with the activated sludge
process? - .....ANSWER ...✔✔ Wasting and return
rates.
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What is the best way to control filamentous bacteria? -
.....ANSWER ...✔✔ Addition of chlorine to the (RAS.)
Called return on some tests.
A 5.2 acre lagoon with an in-fluent of 47000 gallons
per day is dropped 3 inches a day from a depth of 5
feet to a depth of 2 feet. How many gallons are
discharged each day? - .....ANSWER ...✔✔ 470,577
gallons per day (exact problem)
Define endogenous respiration. - .....ANSWER ...✔✔
A situation where living organisms oxidize some of their
own cellular mass instead of new organic matter they
absorb or absorb from their environment.
What should the velocity of the sewage in a gravity
sewer line be coming into the waste water plant? -
.....ANSWER ...✔✔ At least 2.0 Feet per second.
What does hydrogen sulfide do in a collection system? -
.....ANSWER ...✔✔ It causes corrosion.
What must be on the warning tag attached to a switch
that has been locked out? - .....ANSWER ...✔✔ The
WASTEWATER COLLECTIONS III EXAM
QUESTIONS AND ANSWERS 2025
First action for a polymer spill - .....ANSWER ...✔✔
Apply an absorbent to the spill such as sand or kitty
litter and then sweep up the materials.
Total discharge head includes - .....ANSWER ...✔✔
Discharge pressure head + static discharge head +
Velocity head (outlet) + Friction Head (discharge line)
Where is the best location to collect a sample? -
.....ANSWER ...✔✔ A location that represents the
entire waste stream or basin.
What are the preservation and hold times for BOD
samples? - .....ANSWER ...✔✔ 48 hours at < or = to
6 degrees C.
Define BOD. - .....ANSWER ...✔✔ The rate at which
organisms use the oxygen in water or waste water while
,2|Page
stabilizing decomposeable organic matter under
aerobic conditions.
What is the purpose of a dessicator? - .....ANSWER
...✔✔ To allow residual samples to control moisture
prior to weighing.
What will happen if the flow to the grit chamber is too
low? - .....ANSWER ...✔✔ Too much organic material
will be deposited.
How does an operator control the suspended solids in an
activated sludge basin? - .....ANSWER ...✔✔ By
wasting and returning activated sludge.
Chlorine combines with ammonia to form what -
.....ANSWER ...✔✔ Chloramines
What can the operator control with the activated sludge
process? - .....ANSWER ...✔✔ Wasting and return
rates.
, 3|Page
What is the best way to control filamentous bacteria? -
.....ANSWER ...✔✔ Addition of chlorine to the (RAS.)
Called return on some tests.
A 5.2 acre lagoon with an in-fluent of 47000 gallons
per day is dropped 3 inches a day from a depth of 5
feet to a depth of 2 feet. How many gallons are
discharged each day? - .....ANSWER ...✔✔ 470,577
gallons per day (exact problem)
Define endogenous respiration. - .....ANSWER ...✔✔
A situation where living organisms oxidize some of their
own cellular mass instead of new organic matter they
absorb or absorb from their environment.
What should the velocity of the sewage in a gravity
sewer line be coming into the waste water plant? -
.....ANSWER ...✔✔ At least 2.0 Feet per second.
What does hydrogen sulfide do in a collection system? -
.....ANSWER ...✔✔ It causes corrosion.
What must be on the warning tag attached to a switch
that has been locked out? - .....ANSWER ...✔✔ The
